8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5337 Comm: syz.0.344 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813bbc28>] lr : [<813bbc18>] psr: 60000013 sp : df9f5d30 ip : df9f5d30 fp : df9f5d54 r10: 82b16f28 r9 : 00000003 r8 : 84160240 r7 : df9f5d90 r6 : 84160240 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e16b04 r1 : 00000001 r0 : 813bb898 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8593a800 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 84160240 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9f4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2610 Register r8 information: slab kmalloc-192 start 84160240 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdf9f4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2610 Register r12 information: 2-page vmalloc region starting at 0xdf9f4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2610 Process syz.0.344 (pid: 5337, stack limit = 0xdf9f4000) Stack: (0xdf9f5d30 to 0xdf9f6000) 5d20: 82403704 84160240 829cf9ac 829cf9ac 5d40: 81e16fc4 84160284 df9f5d8c df9f5d58 813b7cc4 813bbac0 200000c0 00000000 5d60: df9f5d7c 200000c0 84160240 b5403587 200000c0 85dcec00 40946400 00000003 5d80: df9f5e4c df9f5d90 813b3810 813b7bc8 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f27 00007fff 00000008 00000006 00000005 00000005 00000009 5dc0: 00000008 54c6cff3 000000fd 00000002 00008401 00000006 5da31c5d 00000006 5de0: 00000101 00000000 00000892 0000a418 40000001 00000005 0000caa3 00000008 5e00: 20001e5b 00000000 00000e66 00000004 00000008 00000005 00000000 fffffff8 5e20: 00000000 dd536d38 00000000 85b0a540 84160240 200000c0 200000c0 85dcec00 5e40: df9f5f14 df9f5e50 813b47dc 813b371c 00000000 00000000 00000000 dd536d38 5e60: 00000000 00000000 82477544 0000005f 842f8058 84160270 8418636c 85dcec00 5e80: df9f5ee4 df9f5e90 8079fd20 80796118 00000064 00000001 00000000 df9f5eac 5ea0: 84cdbc10 834fa550 00006400 0000000b df9f5ea0 00000000 00000000 dd536d38 5ec0: 85b0a540 40946400 200000c0 200000c0 85b0a540 00000003 df9f5ef4 df9f5ee8 5ee0: 8079fe40 dd536d38 df9f5f14 40946400 00000000 85b0a541 200000c0 85b0a540 5f00: 00000003 85dcec00 df9f5fa4 df9f5f18 80573398 813b420c ecac8b10 85dcec00 5f20: df9f5f3c df9f5f30 81a4f298 81a4f168 df9f5f54 df9f5f40 8025c288 8028d5d4 5f40: df9f5fb0 40000000 df9f5f84 df9f5f58 802229ec 8025c244 00000000 8281cdf4 5f60: df9f5fb0 0014ca70 ecac8b10 80222940 00000000 dd536d38 df9f5fac 00000000 5f80: 00000000 00316308 00000036 8020029c 85dcec00 00000036 00000000 df9f5fa8 5fa0: 80200060 80573274 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76feb0bc 5fe0: 76feaec0 76feaeb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813bbab4>] (parport_attach) from [<813b7cc4>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84160284 r5:81e16fc4 r4:829cf9ac [<813b7bbc>] (comedi_device_attach) from [<813b3810>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85dcec00 r7:200000c0 r6:b5403587 r5:84160240 r4:200000c0 [<813b3710>] (do_devconfig_ioctl) from [<813b47dc>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85dcec00 r7:200000c0 r6:200000c0 r5:84160240 r4:85b0a540 [<813b4200>] (comedi_unlocked_ioctl) from [<80573398>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813b4200>] (comedi_unlocked_ioctl) from [<80573398>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813b4200>] (comedi_unlocked_ioctl) from [<80573398>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813b4200>] (comedi_unlocked_ioctl) from [<80573398>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85dcec00 r9:00000003 r8:85b0a540 r7:200000c0 r6:85b0a541 r5:00000000 r4:40946400 [<80573268>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9f5fa8 to 0xdf9f5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76feb0bc 5fe0: 76feaec0 76feaeb0 000195a4 00132510 r10:00000036 r9:85dcec00 r8:8020029c r7:00000036 r6:00316308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction